时域均衡器在测井电缆传输系统中的应用

摘要

测井电缆信道的冲激响应具有较长的拖尾,导致严重的子信道间干扰,从而影响OFDM系统的传输速率.利用时域均衡器可以截短电缆信道冲激响应,使之拖尾长度小于OFDM符号的循环前缀长度,从而消除ICI.介绍了一种适于DSP(Digital Signal Processing)软件实现的时域均衡器,该时域均衡器用于基于OFDM技术的电缆高速数据传输系统,可以大大提高系统的传输速率,且仅占用极少的DSP实时运算资源.%As an effective method to solve the problem in logging cable high-speed data transmission, OFDM (Orthogonal Frequency Division Multiplexing) technology is currently being used for logging high-speed data transmission system. However, the logging cable channel impulse response has a longer tail (usually greater than the OFDM symbol cyclic prefix length), which will lead to severe inter sub-channel interference (ICI), thus affecting the transmission rate of OFDM systems. The channel impulse response is reduced by time domain equalizer (TEQ) so it is not exceed the length of the cyclic prefix, thereby the ICI is eliminated. This paper presents a TEQ which is suitable for DSP(Digital Signal Processing) software. The proposed TEQ can greatly improve the transmission rate of logging cable high-speed data transmission on the basis of OFDM technology.